I mean.. sure you could go this route... but I don't see a career in it. You've already proven that you can deliver a high quality product. I think you should spend a few years following the herd and living off your legacy (making it very obvious you are conscious of doing this). We will forgive you for it. Plus new audiences would be exposed to your half-life magnus opum. Once you feel there is a project that resonates with you and would draw the kind of crowd that half life did you return to making a high end drawn out project. Since your audience has matured 10 or so years, there is a good chance many of them have media connections and gratuitous disposable income. This would allow ample opportunity to sell products and afford you enough leverage for blizzard to consider you as a voice actor... Even for a dlc dota package. I've been a broke young adult for like 10 years now, but I'd love the prospect of wearing a new Ross Scott t-shirt to conventions or local card game competitions... but it would be a mute point if the energy that resonated around your legacy was that of reminiscence.
IDK... that just seems like the best route as far as pleasing your fans goes. This whole old school gaming thing seems kinda self indulgent and solopsistic.